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Introduction to Linux

Introduction to Linux​

  • Linux is a term for all operating system which is based on Unix (Predecessor to Linux).
  • First release of linux was in the year 1991.
  • Linux is open source.
  • Linux is secure.
  • Linux is memory efficient and can even run on systems with low memory.

Basic Linux Commands​

  • echo - Prints the given text.
  • whoami - Prints the currently logged in user name.
  • ls - Lists files in the given path.
  • cd - Change to the given directory.
  • cat - Displays the contents of a file.
  • pwd - Prints the path of current working directory.
  • man - Shows manual page of the command.
  • sudo -l - Check the commands that the current user can run.

Basic Flags and Switches​

  • ls -a - Lists files in the given path including the hidden ones.
  • ls --help - Shows the help for the command.
  • ls -h - Print in human readable format.
  • ls -lh - Lists files including file permissions and metadata in human readable format..

Basic Operators​

  • & - Runs command in the background.
  • && - Combine multiple commands in one line. The second command runs only if the first one is successful.
  • > - Redirects the output of a command into a file.
  • >> - Same as redirect operator but instead of overwriting this operator appends to the contents of the file.